TNS Database Error Messages TNS-12640: Authentication adapter initialization failed December 17, 2020 mpbod TNS-12640: Authentication adapter initialization failed Cause: The function specified in the authentication table entry for the service failed. Action: Enable tracing to determine the exact error. Back to previous menu https://support.oracle.com/ http://www.oracle.com/ Share this:Click to email a link to a friend (Opens in new window)Click to print (Opens in new window)Click to share on Facebook (Opens in new window)Click to share on LinkedIn (Opens in new window)Click to share on Tumblr (Opens in new window)Click to share on Twitter (Opens in new window)Click to share on Pinterest (Opens in new window)Click to share on Reddit (Opens in new window)Click to share on Pocket (Opens in new window)